| 1 | /* System-dependent timing definitions. Linux version. |
|---|---|
| 2 | Copyright (C) 1996-2016 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | /* |
| 20 | * Never include this file directly; use <time.h> instead. |
| 21 | */ |
| 22 | |
| 23 | #if defined __need_timeval || defined __USE_GNU |
| 24 | # ifndef _STRUCT_TIMEVAL |
| 25 | # define _STRUCT_TIMEVAL 1 |
| 26 | # include <bits/types.h> |
| 27 | |
| 28 | /* A time value that is accurate to the nearest |
| 29 | microsecond but also has a range of years. */ |
| 30 | struct timeval |
| 31 | { |
| 32 | __time_t tv_sec; /* Seconds. */ |
| 33 | __suseconds_t tv_usec; /* Microseconds. */ |
| 34 | }; |
| 35 | # endif /* struct timeval */ |
| 36 | #endif |
| 37 | |
| 38 | #ifndef __need_timeval |
| 39 | # ifndef _BITS_TIME_H |
| 40 | # define _BITS_TIME_H 1 |
| 41 | |
| 42 | /* ISO/IEC 9899:1999 7.23.1: Components of time |
| 43 | The macro `CLOCKS_PER_SEC' is an expression with type `clock_t' that is |
| 44 | the number per second of the value returned by the `clock' function. */ |
| 45 | /* CAE XSH, Issue 4, Version 2: <time.h> |
| 46 | The value of CLOCKS_PER_SEC is required to be 1 million on all |
| 47 | XSI-conformant systems. */ |
| 48 | # define CLOCKS_PER_SEC ((clock_t) 1000000) |
| 49 | |
| 50 | # if (!defined __STRICT_ANSI__ || defined __USE_POSIX) \ |
| 51 | && !defined __USE_XOPEN2K |
| 52 | /* Even though CLOCKS_PER_SEC has such a strange value CLK_TCK |
| 53 | presents the real value for clock ticks per second for the system. */ |
| 54 | # include <bits/types.h> |
| 55 | extern long int __sysconf (int); |
| 56 | # define CLK_TCK ((__clock_t) __sysconf (2)) /* 2 is _SC_CLK_TCK */ |
| 57 | # endif |
| 58 | |
| 59 | # ifdef __USE_POSIX199309 |
| 60 | /* Identifier for system-wide realtime clock. */ |
| 61 | # define CLOCK_REALTIME 0 |
| 62 | /* Monotonic system-wide clock. */ |
| 63 | # define CLOCK_MONOTONIC 1 |
| 64 | /* High-resolution timer from the CPU. */ |
| 65 | # define CLOCK_PROCESS_CPUTIME_ID 2 |
| 66 | /* Thread-specific CPU-time clock. */ |
| 67 | # define CLOCK_THREAD_CPUTIME_ID 3 |
| 68 | /* Monotonic system-wide clock, not adjusted for frequency scaling. */ |
| 69 | # define CLOCK_MONOTONIC_RAW 4 |
| 70 | /* Identifier for system-wide realtime clock, updated only on ticks. */ |
| 71 | # define CLOCK_REALTIME_COARSE 5 |
| 72 | /* Monotonic system-wide clock, updated only on ticks. */ |
| 73 | # define CLOCK_MONOTONIC_COARSE 6 |
| 74 | /* Monotonic system-wide clock that includes time spent in suspension. */ |
| 75 | # define CLOCK_BOOTTIME 7 |
| 76 | /* Like CLOCK_REALTIME but also wakes suspended system. */ |
| 77 | # define CLOCK_REALTIME_ALARM 8 |
| 78 | /* Like CLOCK_BOOTTIME but also wakes suspended system. */ |
| 79 | # define CLOCK_BOOTTIME_ALARM 9 |
| 80 | /* Like CLOCK_REALTIME but in International Atomic Time. */ |
| 81 | # define CLOCK_TAI 11 |
| 82 | |
| 83 | /* Flag to indicate time is absolute. */ |
| 84 | # define TIMER_ABSTIME 1 |
| 85 | # endif |
| 86 | |
| 87 | # ifdef __USE_GNU |
| 88 | # include <bits/timex.h> |
| 89 | |
| 90 | __BEGIN_DECLS |
| 91 | |
| 92 | /* Tune a POSIX clock. */ |
| 93 | extern int clock_adjtime (__clockid_t __clock_id, struct timex *__utx) __THROW; |
| 94 | |
| 95 | __END_DECLS |
| 96 | # endif /* use GNU */ |
| 97 | |
| 98 | # endif /* bits/time.h */ |
| 99 | #endif |
| 100 | |
| 101 | #undef __need_timeval |
| 102 |